Now that I've been to the track I know I'm 13.1 to 13.2 sec in the 1/4. Is it possible to break 13 sec with bolt-ons? My next move will be exhaust and intake. Could this be enough to do it or will I need to do more? Just currious.

Several (at least a handful) have gone 12.8-12.9@104-105 with just a T-stat and/or fan mod and good air.

So it sounds like the mods I mentioned should do the trick. Hasn't SRT engineering advised against the cooler T-stat claiming they designed the Jeep to run hot. I read something about that in another thread that SRT responded to. I also believe that SRT claimed they had not actually tested the lower T-stat.

So it sounds like the mods I mentioned should do the trick. Hasn't SRT engineering advised against the cooler T-stat claiming they designed the Jeep to run hot. I read something about that in another thread that SRT responded to. I also believe that SRT claimed they had not actually tested the lower T-stat.

The best advice I can give you is to ignore what the SRT engineers say. They're on a short leash so to speak; imagine the potential warranty/liability/emissions implications.
More members than I can count have successfully used a cooler T-stat (MotoRad/Valucraft 383-170 or 383-180 (176*-180)) and found power. We're talking about a solid 2 tenths in the quarter when combined with the also dirt cheap fan mod.
Those same engineers also state that the full factory exhaust is optimal. Etc, etc. etc.

More members than I can count have successfully used a cooler T-stat (MotoRad/Valucraft 383-170 or 383-180 (176*-180)) and found power. We're talking about a solid 2 tenths in the quarter when combined with the also dirt cheap fan mod.

Count me as one of those that went from 13.2 to 12.85 for almost no money. 170* when used above 60* ambient will not throw a code either. This does NOT mean that your JGC will be at 170* while driving....it still reaches 200* range.

Can't believe with this being posted dozens upon dozens of times guys would hesitate to do a simple mod that may take an hour or so for the fan mod (see FAST writeup) and the thermostat change.

changed to 180 thermo, same track (Etown), almost exact same ambient temps, cooldown time, etc. (Dashhawk used to make sure temps were cooler). Efan installed and turned on via switch (Hi side). 60 foot times were about the same also, 1.8-1.9 ranges

TOTAL: $11.99 to pick up 3/10's in 1/4. With more practice on the 60 foot (the 'normal' rule = 1/10 in 60' = 2/10 in 1/4) I believe this is a 12 second Jeep. In fact, Dashhawk is showing better times now that I've found the sweet spot for the powerbrake - 1800 RPM = 3.93 sec 0-60, consistently. Can't wait to get back to track and try again.

Use my link below for the Fan Mod. It will help a ton. This motor is extremely prone to Heat Soak. We ran water on the intake for 20mins and let it cool down for 45min. I gained 1.2 sec. If I had the fan mod at the time I would have been in the 12.s for sure. Also Ice it down if you can. Two bags of ice on the intake will help.

I also believe these motors are slightly starved for air from the factory. The CAI and the exhaust will help it breath much better. OH and move your ITA into the intake box to lower its readings!

Count me as one of those that went from 13.2 to 12.85 for almost no money. 170* when used above 60* ambient will not throw a code either. This does NOT mean that your JGC will be at 170* while driving....it still reaches 200* range.

Can't believe with this being posted dozens upon dozens of times guys would hesitate to do a simple mod that may take an hour or so for the fan mod (see FAST writeup) and the thermostat change.

Question: What temps do the motors get without the t-stat mod? I think the usual rule of thumb is that motors usually make their most available power at just about 200*. Does the stock setup go beyond that? Or do these Hemis make more power @ 170-180ish*?

Also I think you guys would have a lot to benefit from spraying meth/water into the intake stream... and make the ice on the intake a thing of the past.